My point of view and some personal history:
When I was 15, I attempted suicide and was immediately placed, against my will, in a local psychiatric hospital after the initial detox phase in a regular hospital. I'm not entirely sure how long I was there, maybe 2 or 3 weeks? The things I witnessed were traumatic. 6 months later, I was then sent away to a treatment facility in the Bay Area (again, against my will), where I remained for a year and a half. I was given an ultimatum: Go to this program or go to a lockdown facility in Utah. My mother signed my life away. She had sole legal custody, so my dad couldn't do anything. Was I under a conservatorship? I'm not sure. I wanted to run away but I stayed put. Some girls ran away. Some came back. Others opted to go to juvi instead. They let me out when I graduated high school, at age 17. My parents drove me up there, but some are essentially kidnapped from their homes (usually while they're asleep) without prior knowledge that they are being committed (this happened to some of my friends), which you can read more about here: https://www.vice.com/en_us/article/jm5ng4/the-legal-industry-for-kidnapping-teens?fbclid=IwAR0l60kTLKvQcl24MXJNUaZBHuQuqwF-cKS_x0KY5-cgRSPSE47T_jNeh-A
THIS IS STILL A LEGAL PRACTICE. It happens to minors every day but less often to adults.
I would love to assume that it is different for Britney because she is an adult, but the reality is she is seen as a child in the eyes of a law. We don't know exactly what is going on with her, but her story is not all that different from mine. All of this is extremely triggering to me but I've kept my shit together, at least on the forum.
They had us on a phase system, which they changed about halfway during my stay there, along with a bunch of rules which made my "work" feel pointless. Everyone moves through programs differently. I didn't get my first phase for 9 months, during which a lot of upsetting things happened that I won't go into right now. I was not allowed to go on a home visit at all until I got my phase. We could have one residential visit from family once a month, unless we had our privileges revoked. The first residential visit for everyone only lasted 15 minutes. After that, we could have 30 minute visits. Those of us that had family that still somewhat cared about us could then have home visits, which could be extended after phasing up. Phase IV meant we could have unsupervised time. That was like, the pinnacle of everything for us. So, like I said earlier, it is not a surprise that Britney was able to leave the program to get her hair done. Every program has slightly different rules (but not drastically different) and Britney is already experienced with that kind of system. People that have been in treatment centers before are more likely to "graduate" quickly. (One girl graduated the program in 9 months, which was unheard of, but they put her on some kind of fast track.) Maybe she's allowed to use her phone, maybe not. The fact that she used one doesn't mean she's allowed to.
So, when y'all say that it's unrealistic or unbelievable, believe it because this is life for some of us.